Her first international appearance for Ethiopia came in the long race at the
2003 IAAF World Cross Country Championships, where she came 33rd overall. She competed on the track in Japan in 2004, running a best of 15:52.33 minutes for the
5000 metres, but it was another five years until she established herself as a
road running specialist. Basing herself in
The Bronx, New York, alongside her fellow marathon runner and husband Worku Beyi, she began to compete in road races in the United States in 2009. She won the
Fairfield Half Marathon in June and in July she was the runner-up in the women's section of the
Buffalo 4-Mile Chase, That September she won the
Charleston Distance Classic 15-miler and then made her debut over the
marathon, winning on her first try at the
Quad Cities Marathon with a time of 2:44:22 hours. Two months later she ran at the
New York City Marathon and came seventh, significantly improving her best time to 2:35:54 hours. In an untraditional decision for an elite runner, she ran her third marathon in the space of three months at the
California International Marathon and she won the race in a time of 2:32:17 hours. She began 2010 with a personal best of 1:12:50 hours to win at the
Naples Half Marathon and a win at the
National Marathon to Fight Breast Cancer in
Jacksonville Beach followed soon after. She extended her winning streak to seven straight wins by taking the women's titles at the
Broad Street Run,
Newport 10000,
UAE Healthy Kidney 10K,
Grandma's Marathon (with a personal best run of 2:31:35), and the Fairfield Half Marathon. She was tenth at the
Peachtree Road Race on July 4, but returned to her winning ways at the Buffalo 4-Miler and Chris Thater Memorial 5K. Deba secured her third marathon win of the year at the
Twin Cities Marathon in
Minneapolis in October, running a personal best of 2:27:23 hours and beating second placed
Svetlana Ponomarenko by almost eight minutes. She returned to the major race at the
2010 New York City Marathon and came tenth, although her time of 2:29:55 hours was her second run under the 2:30:00-mark. As in the previous year, she closed the season at the California Marathon and she retained her title, bringing her yearly tally to four marathon wins in five appearances. ==2011==